Improvement in sash-fasteners



z ineumem l nven'i m? 1 y w K d/40 Wflwwa I Qqyd UNITED STATES PATENTOFFICE.

GEORGE W. BISHOP, OF SARATOGA SPRINGS, NEW YORK.

IMPROVEMENT IN SASH-FASTENERS.

Specification forming part of Letters Patent No. 137,883, dated April15, 1873; application filed April 4,1873.

To all whom it may concern:

Be it known that I, GEORGE W. BISHOP, of Saratoga Springs, in the countyof Saratoga and State of New York, have invented a new and valuableImprovement in WindowSash Locks; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawingmaking a part of this specification and to the letters and figures ofreference marked thereon.

Figure l of the drawing is a representation of a bottom view of mywindow-sash lock. Fig. 2 is a top View of the same. Fig. 4 is a bottomview of the same. Figs. 3, 5, 6, and 7 are detailed views.

My invention relates to window-locks; and consists in the peculiarconstruction and arrangement of the locking-tumbler and of a lever forwithdrawing the positive stop, as hereinafter specified.

A of the drawing represents a plate adapted for passing into and beingheld in a suitable recess cut in the stop of a window. The

outer surface ofthis plate should be flush with the surface of thewindow-stop, and be secured in position by means of screws passingthrough the openings a a. The letter B represents a lever, pivoted tothe plate at c, and constructed with a concave head having aprojectingpoint, as shown at f. 0 represents a spring, arranged between the flangeof the plate and the back of arm or lever O, the office of which is tothrow the head of said lever forward when desired. D represents a leverpivoted to the plate at n. It is constructed with a thumb-piece, 0,wrist-pin s, which" latter device is adapted to work in a slot, 1, andagainst the front side of the lever B, to

"cess of the window-sash next mentioned, and

also to hold said lever B back and away from the window-sash, whendesirable so to do. To look the window this tumbler is placed in theposition shown by the dotted lines on Fig. 4,

and to hold the arm B back from the sash, I

place it in the position shown on Fig. 1. A

thumb-piece or screw-head, 3 on the front side of the plate enables theoperator to adjust this tumbler at will and in the position desired.

In the side or front of the window-sash I arrange a recess or recessesadapted to receive the extended head of lever B and operate therewith.

What I claim as new, and desire to secure by Letters Patent, is-- 1. Thetumbler H having double eccentrics, as shown, in combination with thelever B, the several parts being so arranged that said tumbler can onlybe attached and detached by the removal of said lever, substantially asspecified.

2. In combination with the slotted plate A and lever B, the lever D withits projections, constructed and adapted to operate substantially as andfor the purpose described.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

GEO. W. BISHOP.

Witnesses:

GEORGE E. UPHAM, 1). D. KANE.

